physics Flashcards
what are the different types of energy?
potential,chemical, electrical, light, sound, thermal, nuclear, and kinetic.
what is a star?
a mass of burning gas, mostly made of hydrogen.
what is cosmology?
the science of the origin and development of the universe.
what does the big bang theory state?
the universe was created by an explosion of matter 13.9 billion years ago.
what is motion?
the change in position of an object.
what is newtons law?
every object moves in a straight line unless acted upon by a force
how many light years is a parsec?
1 pc = 3.26 ly
what is the doppler effect?
when a sound object moves towards you, the frequency of the sound waves increases, leading to a higher pitch.
what is the red and blue doppler shift effect?
a ‘blueshift’ if the light source is coming toward an observer, and a ‘redshift’ if it is moving away.
What is cosmic (microwave) background radiation?
the oldest and most distant light that we can see in the entire universe.
can energy be created?
energy cant be created nor destroyed.
what is newtons second law?
net force is equal to mass times acceleration.
